Table 5. Performance of individual feature added to baseline using gold standard medical concepts.

	Explicit recognizer				Implicit recognizer				Total
	P	R	F	INC	P	R	F	INC	Micro F	INC
Baseline	0.9168	0.7839	0.8452	/	0.9206	0.6919	0.7900	/	0.8320	/
Baseline+DF1	0.9088	0.8296	0.8674	0.0222	0.9224	0.7094	0.8020	0.0120	0.8520	0.0200
Baseline+DF2	0.9239	0.7922	0.8530	0.0078	0.9136	0.7005	0.7930	0.0030	0.8385	0.0065
Baseline+CF	0.9200	0.7883	0.8491	0.0039	0.9198	0.7067	0.7993	0.0093	0.8371	0.0051
Baseline+WF1	0.9297	0.8052	0.8630	0.0178	0.9256	0.7205	0.8103	0.0203	0.8503	0.0183
Baseline+WF2	0.9330	0.8001	0.8615	0.0163	0.9483	0.7403	0.8315	0.0415	0.8542	0.0222
Baseline+WF3	0.9301	0.7987	0.8594	0.0142	0.9377	0.7281	0.8197	0.0297	0.8498	0.0178
Baseline+HF	/	/	/	/	0.9466	0.7419	0.8318	0.0418	/	/

*Inc is increment compared with baseline.